Rooftop Aliens and growth designs

Here I came up with a concept on what the aliens could look like and how they function when I was thinking of what route to go down we discussed as a group,we wanted the aliens to be scavengers and parasites with a very ugly appearance. I decided to come up with a few  features in there anatomy such as spore sacs, growths and to create a very  organic worm like skin to really emphasise them as aliens.

In my creative process I used a black hard edge brush to silhouette  a rough shape of an alien and an infected dog I then made a new layer and built up the detail using the same brush but on 40% opacity  gradually built it up using a grey scale colour scheme.